Woodburner Insert

ABSTRACT

Wood kindling arrangement for quickly kindling of solid fuel in wood burning stove, leading to a reduction of the discharge of polluted chimney gas particle. The wood kindling unit is preferably meant for wood burning stove with closed combustion chamber. When the invention is used you gain a standardized and quickly kindling of solid fuel, resulting in a reduction of the discharge of polluting chimney gas particle. The wood kindling unit consists of en horizontal placed bottom plate ( 1 ), connected to three vertical plates ( 2 ), which have ventilation openings ( 3 ). The hindmost vertical plate has at the top a guiding plate ( 4 ) and a space holder ( 5 ). The two foremost vertical plates are connected with a grate arrangement ( 6 ), which serves as cradle for the fuel. The cavity ( 7 ) under the grate arrangement is applied for the placement of the fire medium under the fuel.

The present invention relates to a wood kindling unit for wood burningstove with closed combustion chamber, which provides a standardized andquickly kindling of solid fuel, resulting in a reduction of thedischarge of polluting chimney gas particle.

The wood kindling unit which must secure a unproblematic kindling ofsolid fuel by means of a grate arrangement is known fx from US patent2004/73206 and WO patent 2004079266, but these patents does not have thepurpose to be used in wood burning stove with closed combustion chamberand they do not have the purpose to secure a directional supply of airfor combustion, resulting in a reduction of the discharge of pollutingchimney gas particle.

In principal the kindling of solid fuel in wood burning stove isproblematic because air- and the ash grate conventionally placement inthe bottom of the burn chamber does not consider an optimal supply ofprimary air to the combustion. Either because the air is blocked of thesolid fuel which is about to be kindled, or if the solid fuel is placedinexpedient in respect to the ash grate you can unintended have too muchsupply of primary air. When blocking the air supply it becomes difficultto kindle the wood because of the lack of primary air for combustion,which leads to a much too low temperature in the burn chamber for theflammable gases to be released and set on fire. When the supply ofprimary air for combustion is too heavy it will result in an unintendedcooling of the fuel and the burn chamber, which prevents an ignition ofthe fuel because of cooling and because the flames are blown away fromthe fuel.

In consequence of said problem it is often necessary to supply the firemedium, fx with newspapers, firelighters or lighter fuel, a number oftimes during the kindling procedure before the heat generation from thefuel is sufficient for the flammable gases to be released in adequateamount, leading to an ignition of the fuel and an autonomous combustion,without the need of supplying further fire media.

From the initiation of the kindling procedure until the ignition of thefuel takes place the combustion is incomplete, in consequence hereofsoothed polluted gases is discharged containing health damagingparticles, among other PAH-compound, tar-compounds and dioxin.

The object of the present invention is to provide a wood kindling unit,which can ensure a quickly kindling of the fuel according to astandardized kindling procedure preventing said problems related to thekindling and pollution.

This is done by placing the wood kindling unit on top of the ash gratein the combustion chamber, where after the fuel, desired to ignite, isplaced on the wood kindling units grate.

After ignition of a fire medium under the fuel a directional and freesupply of air for combustion to the fuel is provided by the woodkindling unit and further the wood kindling unit ensures that the flamesreleased by the fire medium touches the surface of the fuels after apredetermined flow pattern. In this way the heat energy released by thefire medium is concentrated and provides a forced heating of the fueland the oven room resulting in the ignition of the fuel. When theignition of the fuel occurs the combustion becomes autonomous at so hightemperature, that the discharge of polluted chimney gas particle iseliminated or reduced considerable.

The invention consist of a insert to a wood burning stove, where theinsert besides a grate includes a horizontal bottom plate, where the topside is connected to the horizontal lower edges of three verticalrectangular plates and where the two plates are considerable parallel toone mutual distance, corresponding to the extent of the third plate andwhere the three vertical plates are connected considerable in thevertical plate units and where a considerable horizontal gratearrangement is connecting to the 2 parallel plates and placed over thelevel of the horizontal bottom plate, in such a way, that at a cavity iscrated between the bottom plate and the grate arrangement and wherethere are openings for ventilation in the plates, placed over the gratearrangement and where den intermediate vertical plate at least has onein the considerably horizontal guiding plate at the top and aarrangement to keep the vertical distance towards the middle of theinsert.

The wood kindling unit is in full constructed in such a way that theintake of heat energy from the fire medium and the air for combustion isdirectional. In this way it becomes possible to kindle the fuel, leadingto a quickly heating of the fuel surface and oven room, resulting in aquickly development of flammable gases.

The invention provides a placing of the fuel on a grate arrangementresulting in a free inflow of heat energy from the fire medium and theprimary air for combustion via the cavity for the fuel. The bottom plateis constructed so that it is shielding for free inflow of coolingprimary air on the fuel and provides, under the influence ofthermodynamically conditions in the burn chamber, that heated air/gasesis guided towards the cavity which speed up the heating of the fuel. Theventilation holes shown on the vertical site plates has been constructedin such a way that they provides for the supply of heated secondary airto the fuel from the oven room, which speed up the heating of the fuel.The space holder arrangement of the hindmost vertical site plate isconstructed, so as to provide for the heat energy released from the firemedium is swept over on a relatively big surface on the fuel, with highvelocity. The leading plate is constructed in such a manner so as toensure that the heat energy from the fire medium is guided towards thefuel which is placed high in the burn chamber and ignites said fuel.Between the bottom plate and the grate arrangement you have a cavitywhere the fire medium can be placed.

DRAWING

Shown details on the FIGURE for a insert to a woodburning stove, withnumbers of reference:

-   1. bottom plate-   2. rectangular plates-   3. ventilation openings in the plates-   4. horizontal guiding plate-   5. distance holder arrangement-   6. grate arrangement-   7. cavity between the bottom plate and grate arrangement

Insert to a woodburning stove, where the insert includes a grate, ahorizontal bottom plate 1 said top side is connecting to three verticalrectangular plates 2 horizontal lower edges and where the two plates isin the considerable parallel to a mutual distance corresponding to thethird plates extent and where the three vertical plates are connectedconsiderably in the vertical plates and where a considerably horizontalgrate arrangement 6 is connecting to the two parallel plates 2 andplaced over the level of the horizontal bottom plate 1, in this way, acavity 7 is created between the bottom plate and grate arrangement andwhere there are ventilation openings 3 in plates 2 placed over the gratearrangement 6 and where the intermediate vertical plate has at least onein the considerable horizontal guiding plate 4 at the top and a verticalspace arrangement towards the insert middle.

1. insert to a wood burning stove, where the insert includes a gratecharacterized in that it further comprises a horizontal bottom plate(1), where said top side is connecting to three vertical rectangularplates (2) horizontal lower edges and where the two plates is in theconsiderable parallel to a mutual distance corresponding to the thirdplates extent and where the three vertical plates are connectedconsiderably in the vertical plates and where a considerably horizontalgrate arrangement (6) is connecting to the 2 parallel plates (2) andplaced over the level of the horizontal bottom plate (1), in this way, acavity (7) is created between the bottom plate and grate arrangement andwhere there are ventilation openings (3) in plates (2) placed over thegrate arrangement (6) and where the intermediate vertical plate has atleast one in the considerable horizontal guiding plate (4) at the topand a vertical space arrangement towards the insert middle.